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Senator Specter's decision is a continuation of what we have seen across the nation -- at least since the 2006 Democratic Congressional takeover of both Houses of Congress and the substantial margin of Barack Obama's victory and further dramatic gains by Democrats in the Congress in 2008 -- the expanding strength of the Democratic Party among moderates and independents. Specter has exemplified just such a moderate and independent political profile for many years.

Today's move by Senator Specter to the Democratic Party points to the further narrowing of the Republican Party to an ideological, "just say no" conservative band that appears to be out of touch with the mainstream of the country.