A year after her first war protest in President Bush's adopted hometown attracted thousands and reinvigorated the nation's peace movement, Cindy Sheehan resumed her vigil Sunday. Under the blazing Texas sun, Sheehan and more than 50 demonstrators again marched a mile and a half toward Bush's ranch, stopping at a roadblock. As Secret Service agents stood silently, Sheehan held up her California driver's license and said she wanted to meet with the president.