HAMPTON, Va. — Mitt Romney might still be having trouble putting away his challengers for the Republican presidential nomination, but the Obama campaign continues to treat him like their top competitor.

Obama 2012 is taking shots at the former Massachusetts governor at nearly every opportunity these days, even when an opening is not necessarily obvious.

An example: The Washington Post reported Wednesday that the Republican candidates have been criticizing Obama for relying too heavily on teleprompters when he gives speeches.

Asked by the Post to respond to the criticism, the Obama campaign instead chose to go after Romney.

“We hear the Romney campaign will start providing their candidate with a transcript of what he said the day before, just in case he suddenly decides he wants to stand by it,” Obama campaign spokesman Ben LaBolt said in an e-mail to the Post.

LaBolt’s dig comes a week after Obama campaign strategist David Axelrod hammered Romney for 20 minutes during a conference call with reporters, painting him as a flip-flopper on issues ranging from taxes to health care.

Axelrod has been on the television airwaves this week hitting Romney, telling CBS on Wednesday morning that the former Massachusetts governor has “no core to him.”

The Obama team is eager to begin creating doubt about Romney, who many political analysts have said would have the best chances of unseating the president, among both Republican primary voters and for a potential general election matchup.

The feeling is mutual, of course. No sooner did Obama sit down for an interview Tuesday with ABC News than Romney’s press team blasted the president for giving himself an “incomplete” grade when asked to assess his performance by White House correspondent Jake Tapper.

Romney’s camp issued a press release Wednesday morning, which played off the U.S. summer credit rating downgrade with the title: “ANOTHER DOWNGRADE: PRESIDENT OBAMA DROPS FROM B+ TO ‘INCOMPLETE.’”

“The American people deserve a president who will upgrade the economy, not someone with a record of repeated failures,” said Romney communications director Gail Gitcho.