As Senator Clinton prepares to face off with many of her Democratic rivals today, she aligned herself directly with President Bush on the issue of immigration, using a campaign stop in South Florida to highlight a rare point of agreement with an administration that she criticizes at every turn. Speaking to about 300 community leaders in an area with a large immigrant population, Mrs. Clinton staked out a centrist position on the hot-button topic, saying she supported a "pathway to legalization" for the nation's 11 million to 12 million estimated undocumented immigrants, but only if they waited in line and...