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Republican presidential candidate Mitt Romney shakes hands with Sen. Marco Rubio after he introduced Romney during a town hall-style meeting in Aston, Pa.
Jae C. Hong/AP
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Mitt Romney is endorsed by Sen. Kelly Ayotte outside City Hall in Nashua, N.H.
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Mitt Romney listens as Virginia Gov. Bob McDonnell speaks during a campaign event at Crofton Industries in Portsmouth, Va.
Win McNamee/Getty Images
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Mitt Romney campaigns with South Carolina Gov. Nikki Haley in Columbia, S.C.
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Mitt Romney, accompanied by Sen. John Thune speaks to a group of workers at Nationwide Insurance Company in Des Moines, Iowa.
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Sen. Rob Portman introduces Mitt Romney during a campaign event in Cincinnati, Ohio.
Mark Lyons/Getty Images
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Mitt Romney and New Jersey Gov. Chris Christie during a campaign rally in Exeter, N.H.
Justin Sullivan/Getty Images
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House Budget Committee Chairman Rep. Paul Ryan introduces Mitt Romney in Milwaukee, Wisconsin.
M. Spencer Green/AP
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Tim Pawlenty and Mitt Romney in Bloomington, Minn.
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