To get an edge in advance of Florida’s Republican presidential primary, Mitt Romney has gone after Newt Gingrich this week on his ties to Freddie Mac. At first blush, it’s not a bad move; Gingrich is clearly vulnerable on the subject.

But Romney may not have thought the attacks all the way through.

According to his personal finance disclosure forms, Romney invested pretty heavily in Freddie Mac and made a fair amount of money doing so.

Asked about this on Fox News this morning, Romney was reduced to lying.

BRIAN KILMEADE: Yesterday Newt Gingrich joined us and said, “I just found out that Mitt Romney was in investor in Fannie & Freddie.” What’s the truth?

MITT ROMNEY: [Laughs] That’s pretty funny. My investments, of course, are managed not by me. For the last 10 years they’ve been guided and managed by a trustee, they’re in a blind trust. And the trustee invested in mutual funds and so forth and apparently one of the funds had Fannie Mae or Freddie Mac bonds.

We already know that’s not true. The Boston Globe reported on some of Romney’s finances a few months ago, and specifically noted, “[U]nlike most of Romney’s financial holdings, which are held in a blind trust that is overseen by a trustee and not known to Romney, this particular investment was among those that would have been known to Romney.”

The “blind trust” line isn’t going to cut it.

For that matter, Romney is slamming Gingrich for lobbying on behalf of Freddie Mac, but at the same time, a top Romney campaign surrogate and advisor is also — you guessed it — a former lobbyist for Freddie Mac.

Romney’s campaign really ought to be paying closer attention to these details.

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Follow Steve on Twitter @stevebenen. Steve Benen is a producer at MSNBC's The Rachel Maddow Show. He was the principal contributor to the Washington Monthly's Political Animal blog from August 2008 until January 2012.