WASHINGTON (CNN) -- Veteran Sen. Arlen Specter, R-Pennsylvania, intends to switch from the Republican to the Democratic Party on Tuesday, multiple sources said.
Sen. Arlen Specter was expected to face a tough primary challenge in 2010.
A Specter party switch would give Democrats a filibuster-proof Senate majority of 60 seats if Al Franken holds his current lead in the disputed Minnesota Senate race.
Specter, a five-term Senate veteran, was expected to face a very tough primary challenge in 2010 from former Rep. Pat Toomey, who nearly defeated Specter in the Pennsylvania GOP Senate primary in 2004.
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