May 7, 2007 -- GOV. Spitzer's plan to legalize gay marriage is dividing Democrats, harming Sen. Hillary Clinton's presidential ambitions, and handing Republicans their first strong campaign issue in some time, officials told The Post. "This could turn out to be the Democrats' Achilles' heel," crowed Assembly Minority Leader James Tedisco, a Schenectady Republican who has seen a sharp drop in the Legislature's GOP membership in recent years. -- SNIP -- His action forced the Assembly's majority Democrats, who have avoided taking sides on the polarizing issue for years, to confront what is expected to be a bitter internal debate...