It's begun already: With Republicans gaining control of both the White House and Congress, Bush administration officials last night began to prepare an ambitious legislative agenda to press their new -- and somewhat unexpected -- advantage. Suddenly, items that had been bottled up in the Democratic Senate have new life. President Bush has new hopes for action on his conservative slate of judges, his energy plan calling for drilling in Alaska's wildlife refuge, and the policies he favors on topics such as homeland security, terrorism insurance and prescription drug coverage. With Democrats losing their ability to set the Senate schedule and launch probes of the administration, chances improve for Bush's hopes to extend last year's tax cuts, curtail jury awards, cut business regulations and overhaul Medicare.