Candidate for the U.S. Senate seat left empty by the death of Sen. Edward M. Kennedy, D-Mass., Massachusetts Attorney General Democrat Martha Coakley shakes hands with Yen Tran, right, originally of Vietnam, now of Boston, Mass., while visiting a senior center in the Dorchester neighborhood of Boston, Wednesday, Jan. 13, 2010. (AP Photo/Gretchen Ertl)

BOSTON - What for weeks had been a polite - even sleepy - race in Massachusetts to fill the late Edward M. Kennedy's Senate seat has turned negative as the contest tightens, raising the stakes for both parties and the White House in next week's special election.

In a 48-hour span:

-Democrat Martha Coakley, who had been heavily favored, unleashed a TV ad attacking her GOP opponent, Scott Brown, as "in lockstep with Washington Republicans."

-The national committee charged with electing Senate Democrats rolled out an ad claiming Massachusetts voters know little about Brown and imploring them not to let him "take them for a ride."

-The Service Employees International Union went on the air with a spot that says Brown "calls himself independent, but voted with Republican leadership 96 percent of the time," opposes abortion rights and is backed by some of Sarah Palin's supporters.

The late-game strategy: use Republicans as a foil in a Democratic state to undercut Brown, who has cast himself as an independent and downplayed his conservative credentials.

The onslaught of negative TV ads and arrival of out-of-state operatives underscore Democrats' worry that their hold on the seat in a solidly Democratic state is in jeopardy - and that they could lose the pivotal 60th Senate vote needed to pass President Barack Obama's health care overhaul and other legislation.

Republican-allied groups have gone negative as well, reaching for a long-shot upset and sensing that Brown has momentum in a difficult political environment for Democrats. "Coakley supports massive new spending and the tax increases to pay for it," says one commercial by the conservative American Future Fund.

The Republican National Committee and the GOP's Senate campaign committee are working behind the scenes to help elect Brown but aren't pouring TV money into the race, raising questions about whether they really think Brown can win or whether they are afraid of reminding voters that Brown is a Republican.

They also have withheld campaign appearances by national GOP figures who could hurt Brown, although former New York mayor Rudolph Giuliani will visit Massachusetts on Friday to vouch for the candidate's anti-terrorism credentials.

Public opinion polls and internal candidate and party surveys show a race fluctuating between a 15-point lead for Coakley to a 2-point lead for Brown. Among the biggest unknowns is voter turnout, since this special election will take place the day after the Martin Luther King holiday weekend when many voters will be traveling.

The Boston Globe endorsed Coakley on Wednesday. (Emphasis added)

Kennedy's widow, Vicki, sent out a fundraising e-mail Wednesday that Coakley aides say raised at least $400,000 in four hours and crashed their computer server.

Democrats say all the late national attention could undercut Brown - and save health care for Obama - by energizing complacent voters in the traditionally Democratic state.

Both candidates have vulnerabilities that could provide fodder for more negative ads in the final week. (Emphasis added)

Obama cited a continuing terrorist threat late last year in justifying his decision to send more troops to Afghanistan.

Brown, meanwhile, was silenced in the debate when the independent candidate in the race, Joseph L. Kennedy, noted he has been calling for a "JFK-style" across-the-board cut in federal taxes - but opposed a proposed rollback in the Massachusetts income tax two years ago. (Emphasis added)

Brown also seeks a presidential line-item veto to reduce government spending, but as a state senator he has repeatedly voted to override gubernatorial spending vetoes - many issued when Republican Mitt Romney was governor. (Emphasis added)

More . . .

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U.S. SENATE PROFILES

Scott Brown (R)

Martha Coakley (D)
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Good summary article and great candidates summaries.