At least 80 wealthy liberals have pledged to contribute $1 million or more apiece to fund a network of think tanks and advocacy groups to compete with the potent conservative infrastructure built up over the past three decades. The money will be channeled through a new partnership called the Democracy Alliance, which was founded last spring -- the latest in a series of liberal initiatives as the Democratic Party and its allies continue to struggle with the loss of the House and the Senate in 1994 and the presidency in 2000. Many influential Democratic contributors were left angry and despairing...