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By JEFF ZELENY Published: September 12, 2009 WASHINGTON —A sea of protesters filled the west lawn of the Capitol and spilled onto the National Mall on Saturday in the largest rally against President Obama since he took office, a culmination ofa summer-long season of protests that began with opposition toa health care overhaul and grew into a broader dissatisfaction with government. Multimedia Slide Show Protest in Washington Blog The Caucus The latest on President Obama, the new administration and other news from Washington and around the nation. Join the discussion. ? More Politics News Enlarge This Image Brendan Smialowski/Getty Images Protesters gather and wave flags on Capitol Hill during the Tea Party Express rally on Saturday in Washington, DC. More Photos ? Enlarge This Image Amanda Lucidon for The New York Times Protesters in Washington . during a rally on Saturday. More Photos > On a cloudy and cool day, the demonstrators came from all corners of the country, waving American flags and handwritten signs explaining the root of their frustrations. Their anger stretched well beyond the health care legislation moving through Congress, with shouts of support for gun rights, lower taxes and a smaller government. But as they sang verse after verse of patriotic hymns like “ God Bless America, ” sharp words of profane and political criticism were aimed at Mr. Obama and Congre