Sen. Marco Rubio (Fla.) voted in favor, while Sens. Rand Paul (Ky.) and Ted Cruz (Texas) opposed it.
GOP Presidential Primary
Many Republicans warn he'll have to learn to stay on message if hopes to launch a credible campaign in 2016.
Paul had hoped to win enough delegates to be nominated and secure a speaking slot at the national convention.
Of the two components to Romney’s economic argument against Obama, he’s in the midst of arguing the most important one.
In a statement, Paul said his 200 delegates gave him an opportunity to "shape the future of the GOP."
Romney’s combative first month could hint that he’s looking to another archetype for vice president.
Mitt Romney is using Hispanics’ double-digit unemployment rate to argue that the key voting bloc should support him instead of President Obama.
Mitt Romney won the Arkansas Republican presidential primary on Tuesday, pushing him closer to the 1,144 delegates he needs to clinch the Republican nomination.
The Associated Press projected Romney's victory shortly after the polls closed at 9 p.m. ET.
There were 36 delegates at stake in the Arkansas primary, and another 45 in Kentucky, which also held its primary on Tuesday. Romney won both contests, and will take the bulk of the delegates in each state.
With victories in Kentucky and Arkansas, Mitt Romney moves closer to reaching the 1,144-delegate threshold.
Former GOP presidential contender Newt Gingrich's campaign is $4.8 million in the red, according to data filed with the Federal Election Commission.
Gingrich’s campaign debts include nearly $1 million for air travel, $466,370 for security, and over $300,000 for consulting and online advertising combined.