WASHINGTON - President Bush's first step toward creating a democratic Iraq may be the most problematic: "Transfer full sovereignty." Each part of the plan is marked by uncertainties that could undermine the entire process. A look at possible roadblocks in the run-up to the June 30 political handover: _transferring full sovereignty to a government of Iraqi citizens. U.N. envoy Lakhdar Brahimi is expected to recommend leaders of the new interim government within days. It is unclear if Brahimi will succeed in naming a government that satisfies Iraq's main factions. Shiites, Sunnis and Kurds have different views about who should serve...