The selection of running mates in this year's presidential election is taking longer than normal.
So far, neither Sen. John McCain nor Sen. Barack Obama has announced a vice presidential candidate. However, in the past four election years, the VP was announced for both parties no later than August 10, and in many cases, much earlier.
For example, in 2004, John Kerry decided on John Edwards as his VP on July 6.
In 2000, George W. Bush chose Dick Cheney on July 25, while Al Gore picked Joe Lieberman on August 8.
In 1996, Bob Dole announced he was running with Dick Kemp on August 10, and in 1992, Bill Clinton picked Al Gore on July 10.