SUN CITY CENTER, Fla., May 9 — President Bush and his brother continued their awkward dance today with Representative Katherine Harris of Florida, whose run for the Republican Senate nomination this year they have met with chilliness. Ms. Harris was on hand this morning to meet President Bush as he stopped in Tampa en route to a Medicare event in this nearby, senior-rich town — just one day after Governor Jeb Bush said publicly that he did not believe Ms. Harris could win against the Democratic incumbent Senator here, Bill Nelson. Jeb Bush was there, too, as Ms. Harris waited...