The New York Times did a drop-in yesterday on the Scott Brown/Elizabeth Warren Massachusetts Senate bakeoff:

G.O.P. Senator Uses President for Help in Ad

CAMBRIDGE, Mass. — President Obama is appearing in yet another television commercial in the Massachusetts Senate race. This time, it was not produced by the Democratic candidate, Elizabeth Warren, but by the Republican, Senator Scott P. Brown.

The advertisement, which was scheduled to start running on Saturday, shows Mr. Obama praising Mr. Brown for sponsoring a bill to end insider trading in Congress. As Mr. Obama signs the measure into law, he thanks Mr. Brown, saying, “Good job.”

The spot:

This is a big problem for Warren, The Times notes: “Polls suggested that [Brown] was attracting as many as one in five Democrats and one in four Obama voters.”

Of course, Warren needs as many as five in five Democrats and four in four Obama voters.

Not to get technical about it.