Obama added his appearance at the memorial service onto a long-planned trip to Texas for Thursday's opening of George W. Bush's presidential library at Southern Methodist University.

NPR: Obama Consoles Families, Survivors Of Texas Blast

Romney has now added a campaign appearance for Friday in New Hampshire, where he owns a home and announced his presidential bid last year, feeding speculation that he may announce the pick before the weekend.

CNN: Romney risks playing running mate hand too early

Montblanc added variety to the overall appearance of the timepieces, Cabiddu said.

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