In December, Susan Bysiewicz, former Secretary of the State and candidate for U.S. Senate, issued an extensive, detailed and nuanced plan for Congress.
By the end of January, she seems to have gone into attack mode.
This was sent out today:

“Congressman Chris Murphy’s excuse just doesn’t hold up. He has voted multiple times to increase the deficit but when the Democratic majority was on the verge of closing the carried interest loophole he suddenly was against more spending."

That statement came after Bysiewicz tried to tie Murphy to Romney, as Brian Lockhart reported, with the Murphy campaign arguing that the bill that the congressman could have signed would have added $54 billion to the deficit.

Murphy may still be considered the front-runner in the Democratic race for the Senate, but it's hard to argue that Susan isn't in attack mode, when she says stuff like this:

"It is no wonder that Congressman Chris Murphy has gone on to raise over $300,000 from Wall Street for his campaign for US Senate and is one of the top recipients of contributions from Hedge Funds.”

The change in tone may work for Bysiewicz. It may not. It will be interesting to see if the tone of the primary race in general changes as well.