Hagel lags in Iowa '08 parade BY JAKE THOMPSON WASHINGTON - In two weeks, when Sen. Chuck Hagel takes his first step on the Iowa section of the 2008 presidential campaign trail, he will find a hard, well-trod path. Among fellow Republicans, New York Gov. George Pataki is preparing for his third Iowa visit. Sen. Sam Brownback of Kansas has popped in at least five times. So has Arkansas Gov. Mike Huckabee. Senate Majority Leader Bill Frist of Tennessee is headlining a big GOP dinner soon in Iowa. Democrats weighing White House bids have been tramping across the Hawkeye State,...