Liz Halloran

Republican congressman Ron Paul on Sunday turned his presidential swan song into a feisty rage against the political machine of his own party for legally manipulating him out of presidential convention delegates.

"They've learned how to bend rules, break rules and now they want to rewrite the rules," Paul told a raucous crowd of nearly 10,000 supporters who nearly filled the Sun Dome arena in Tampa, the city hosting this week's hurricane-delayed Republican National Convention.

Mitt Romney, 65, has spent the better part of a decade running for president. And as the son of a Michigan governor who headed a Detroit auto company, he's been in the public eye much longer.

Yet the former Massachusetts governor has remained an enigma to many voters, his political positions malleable, and much of his business and private life — including his Mormon religion — intentionally obscured.

Or simply declared off limits, like years of his tax returns.

Picking Wisconsin Rep. Paul Ryan as his running mate has helped GOP presidential candidate Mitt Romney in the Badger State, but just a little, a new poll suggests.

Obama leads Romney among likely voters in Wisconsin, 49 percent to 46 percent, according to a Marquette Law School poll released Wednesday afternoon. The poll was conducted Aug. 16 through 19, following Ryan's selection as Romney's running mate on Aug. 11.

GOP officials and the Mitt Romney campaign have cut a deal with Texas Rep. Ron Paul's campaign to allow some — though not all — of Paul's delegates from Louisiana and Massachusetts to be seated at the Republican National Convention. The status of Maine's delegates remains unsettled.

The compromise would appear to avert a potential public clash with Paul supporters during the convention's opening day Monday.

Since GOP presidential candidate Mitt Romney picked Rep. Paul Ryan of Wisconsin as his running mate, seems all we've been hearing about is Medicare and its future.

No surprise, of course: Ryan is the author of the GOP budget plan that would dramatically remake how the health care insurance program for seniors is managed and funded. He also calls for big changes to Medicaid, the insurance program for the poor, including elderly Americans who have exhausted their means.

The question of whether GOP vice presidential pick Rep. Paul Ryan of Wisconsin will ultimately help or hurt Mitt Romney's quest for the White House is the subject of fierce debate.

But some politicos are calling Ryan a kingmaker following former longtime Wisconsin Gov. Tommy Thompson's slim victory Tuesday in the hotly contested, four-way Republican U.S Senate primary.

Why? Ryan gave Thompson a shout-out at a Badger State homecoming rally Sunday, and the former governor quickly incorporated the veep pick's endorsement-of-sorts into a campaign ad.

One of the candidates is House Speaker John Boehner's close friend and golfing buddy.

The other is an ally of House Minority Leader Nancy Pelosi.

Both have their roots in rural Iowa, have long served together in the U.S. House, and are pretty darn well-liked by their constituents.

But Iowa, the focus of the political world this week, lost a House seat in congressional redistricting that came after the 2010 census.

Who Is He?

Joe Biden: Biden, whose own presidential aspirations sputtered in 1988 and again in 2008, brought to the Democratic ticket foreign policy chops and an ability to relate to working-class voters. In his 36 years representing Delaware in the U.S. Senate, he became known as more pragmatist than ideologue. He has also made a somewhat dubious name for himself because of his volubility and not infrequent verbal stumbles. But he has parlayed those potential liabilities into an effective, if occasionally unpredictable, campaign trail presence.

Republican presidential candidate Mitt Romney discarded his increasingly inert better-safe-than-sorry campaign strategy Saturday when he named budget hawk and Democratic bete noire Rep. Paul Ryan of Wisconsin as his running mate.

The line at the cavernous Smokey Row Coffee House in Oskaloosa stretched out the door and down the block, so long that dozens of Iowans waiting to see presidential candidate Barack Obama had to settle for a peek through the windows.

It was July 4, 2007, heady days for Obama in the Hawkeye State, where Democratic caucusgoers would soon launch him as a legitimate national contender, and where state voters would later turn out in record numbers to help put the first-term Illinois senator into the White House.

Republican presidential candidate Mitt Romney continued Tuesday to push back on calls to release more years of tax returns and defended keeping investments in offshore accounts — both issues that have been dogging his run for the White House.

As the presidential campaigns continue to ramp up their attacks (see: felon, liar, outsourcing), the candidates are homing in this week on the country's electoral fertile crescent.

President Obama may have disappointed the NAACP by appearing only via brief video message Thursday at the civil rights group's annual gathering — especially after Mitt Romney had personally taken the stage a day earlier.

But sending in Vice President Biden to stir things up, just 24 hours after Romney was booed while delivering a conservative message meant to resonate beyond the walls of the Houston convention center, seemed to work out just fine for Obama.

Below are President Obama's and Republican challenger Mitt Romney's policies and proposals regarding immigration. NPR will be comparing the two candidates on various issues in the run-up to the November election. If you have suggestions for other issues you'd like us to explore, please leave a note in the comments section below.

DREAM Act:

Obama:

Supports; also endorses letting foreign students stay in U.S. after college graduation.