President Obama joined Sen. Mary Landrieu on a conference call Monday to offer his endorsement in advance of her run-off election Saturday, even though Landrieu has focused during her re-election on separating herself from the president.

Obama said Landrieu "has been an outstanding advocate on behalf of Louisiana working families every step of the way," according to a tweet Monday by the Louisiana Democratic Party. A party spokeswoman did not comment.

Angela Young, a Louisiana-based consultant and Landrieu supporter, also tweeted Monday morning about Obama's endorsement on the call: "He's with @MaryLandrieu and so am I!!!!"

The president's last-minute support of Landrieu is noteworthy because she has spent the entire election cycle seeking to emerge from his political shadow, including in the run-off to be decided Saturday. A spokesman for Landrieu did not comment on the president's endorsement.

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