Mitt Romney is campaigning in Colorado today, where he lost to Rick Santorum during the bruising Republican primary battle. But in a radio interview today Romney said the Democrats are the ones with a unity problem, especially after a prison inmate in West Virginia was able to get more than 40 percent of the Democratic vote against President Obama in the primary there Tuesday.

"The polls I see that ask Republicans who are you gonna vote for, some 90-plus percent said they're supporting me, so that's more Republicans supporting me than Democrats supporting the president, so if there's a rift in the party, I think it's his," Romney said on KOA Colorado radio.  "I saw in West Virginia, for instance, that an inmate got almost 40 percent of the vote against President Obama for the convention, so I think they got more problems on that side of the aisle than we do on ours."

President Obama received 60 percent of the vote and his campaign told ABC News earlier today that Keith Russell Judd, an inmate at the Beaumont Federal Correctional Institution in Beaumont, Texas will not be awarded any delegates.

Although the bruising GOP primary battle is over, Romney's most serious opponents, Rick Santorum and Newt Gingrich, have only given him the most tepid of endorsements. On Monday Santorum sent out a lukewarm late night email telling his supporters he was endorsing Romney. The news came in the 16th of 19 paragraphs.

Romney said on KOA he's "pleased that each of these fellows have come and supported me."

Romney said the primary battle - one in which Santorum called Romney among other things the  "worst Republican in the country to put up against Barack Obama" - was a "normal process in primaries" and not a sign of a fractured party.

Romney also raised some eyebrows this week when he took credit for the auto bailout Monday.

"My own view, by the way, was that the auto companies needed to go through bankruptcy before government help, and frankly that's finally what the President did," Romney said during an interview with ABC News'  Cleveland affiliate WEWS.

Today, Romney said he's had "the same position on the auto bailout I had from the very beginning. I actually wrote about it, so nothing's changed there." Democrats dried foul yesterday, saying his claim was " a new low in dishonesty."

In Romney's controversial 2008 "Let Detroit Go Bankrupt" New York Times op-ed, he said a "managed bankruptcy" would have had faster, more effective results.

In today's radio interview, Romney did not give any hints about who he may choose as his running mate, saying it was possible he may decide "just in the few days before the convention," but "it's also possible to go before that."

"We're looking at a pretty significant group of people, and we've got a great group of Republican leaders, and I want to take a very careful look and make sure that we select someone who has the capacity to become president if that were necessary," Romney said, adding he's considering "people of both genders."