To take advantage of today’s announcement that Alaska Governor Sarah Palin has joined Sen. John McCain’s bid for the White House, an advocacy group is pushing the presumed Republican vice presidential nominee to commit to helping poor people worldwide.

Only hours after the announcement, the ONE Campaign sent an e-mail message to supporters asking that they send a “digital postcard” to Ms. Palin, which says: “Congratulations on being picked to be #2 on the ticket. We hope you’ll be in the fight to end global poverty.”

On the organization’s blog, Virginia Simmons, ONE’s online communications director, points out that the next few days are crucial in making an impression on the Alaska governor.

“Soon Palin will be engulfed in campaigning and national media, so now is our moment to break through the clutter,” she writes.

The ONE Campaign started a similar effort when Sen. Joe Biden of Delaware was picked as the Democratic vice presidential nominee.