Presidential field narrows and intensifies campaigns

Wednesday, January 30, 2008 | 9:57 p.m. CST; updated 2:53 a.m. CDT, Sunday, July 20, 2008

SIMI VALLEY, Calif. — With Democrat John Edwards and Republican Rudolph Giuliani retreating to the sidelines, the presidential nomination battles narrowed to a pair of head-to-head contests Wednesday as the remaining candidates dug in for five days of intensive campaigning before a critical Super Tuesday showdown next week.