Gonzalo Hernandez stands outside a Scottsdale, Ariz., resort Monday protesting GOP presidential hopeful Mitt Romney, who was speaking inside, and Arizona's immigration law, a key part of which was upheld by the Supreme Court. (Associated Press)
Shannon Westfield, 20, (left) and Jane Kernan, 16, make calls for Mitt Romney in Fairfax wearing T-shirts with a QR code that voters can zap with their smartphones to learn more about the GOP presidential hopeful. In May, Mr. Romney's fundraising almost matched President Obama's, taking in $58 million. (Associated Press)
Presumptive GOP presidential nominee Mitt Romney campaigns in Frankenmuth, Mich., on Tuesday alongside his wife, Ann, and Michigan Gov. Rick Snyder. Mr. Romney's campaign called his six-state bus swing the "Every Town Counts" tour. (Associated Press)
Sen. Marco Rubio, Florida Republican, has said he does not expect to be on the GOP ticket this year, but he has campaigned with the likely nominee. (Associated Press)
The campaign of presumptive GOP presidential nominee Mitt Romney thinks it can end Pennsylvania's Democratic presidential streak at five. (Associated Press)
Majority Leader Eric Cantor of Virginia, followed by Rep. Jeb Hensarling, Texas Republican, right, leaves a GOP strategy session on Capitol Hill in Washington, Thursday, May 31, 2012. (AP Photo/J. Scott Applewhite)
** FILE ** House Speaker John Boehner of Ohio meets with reporters following a GOP strategy session on Capitol Hill in Washington, Thursday, May 31, 2012. (AP Photo/J. Scott Applewhite)
** FILE ** In this March 31, 2012, photo, Rep. Rick Berg, North Dakota Republican, speaks before the North Dakota GOP Convention in Bismarck, N.D. Berg is running for the Senate seat being vacated by Sen. Kent Conrad. (AP Photo/Will Kincaid, File)
Mitt Romney, the presumptive GOP presidential nominee, delivers the commencement address at Liberty University in Lynchburg, Va., on Saturday. (Associated Press)