Chicago (AP) -- Barack Obama will publicly disclose his Vice Presidential choice in the coming days.

But the Democrat is keeping most aides who are preparing for the announcement in the dark and is giving away nothing to voters as he campaigns.

For his part, Republican rival John McCain is seriously considering naming his running mate between the end of the Democratic Convention on August 28th and the September 1st start of the GOP Convention.

McCain hopes to stop any bounce in the polls for Obama that the Illinois Senator will likely get from the Democratic convention. McCain has at least three large rallies planned in top battlegrounds Ohio, Pennsylvania and Michigan, before the republican gathering in St. Paul, Minnesota.

(Copyright 2008 by The Associated Press. All Rights Reserved.)