(Image Credit: Susan Walsh/AP Photo)

House Speaker John Boehner formally endorsed Mitt Romney this morning, becoming one of the last major Republican leaders to coalesce behind the presumptive nominee.

"I've not taken a position on this presidential campaign because, as chairman of the convention, I wanted to make sure all candidates had a fair process and a fair opportunity," said Boehner, who had previously said he would not endorse a candidate at all.

"But it's clear now Mitt Romney is going to be our nominee," the Ohioan said during his weekly news conference.

"I think Mitt Romney has a set of economic policies that can put Americans back to work and, frankly, contrast sharply with the failed economic policies of President Obama," he added. "And I will be proud to support Mitt Romney and do everything I can to help him win."