As the Senate prepares to take up legislation aimed at overhauling the nation's healthcare system, President Obama and the Democrats are still struggling to win the battle for public opinion. A new Washington Post-ABC News poll shows Americans deeply divided over the proposals under consideration and majorities predicting higher costs ahead. But Republican opponents have done little better in rallying the public opposition to kill the reform effort. Americans continue to support key elements of the legislation, including a mandate that employers provide health insurance to their workers and access to a government-sponsored insurance plan for those people without insurance. The new poll provides ammunition for both advocates and opponents of reform.