Rep. Joe Sestak (D-Pa.) backed President Obama's call for a $50 billion in additional spending for improvements to the nation's infrastructure Tuesday. 

Here's how the Christian Science Monitor characterized Sestak's remarks Tuesday: 

Senate hopeful Rep. Joe Sestak (D) of Pennsylvania today backed President Obama’s call on Labor Day for $50 billion in new stimulus spending to create infrastructure jobs — and, anticipating the president’s speech in Cleveland on Thursday, another $200 billion in research-and-development tax credits for business. 

But in a campaign season where the polls are running hard against incumbent Democrats, Congressman Sestak says he wishes his party’s focus on jobs had come about 18 months earlier – and not just because the polls have gone south. 

“Why now? We’re doing it for the polls, we should be doing it because it’s the right thing to do,” he said in a speech on the economy at Carnegie Mellon University.

A spokesman for the Sestak campaign noted he wasn't specifically referring to the president's proposed infrastructure spending, but that he was encouraging a focus on supporting small business and thinks more should have been done on that front over the past 18 months. 

Here's a link to Sestak's full speech Tuesday, which focused on his plan to buck up small business.

Sestak is facing former Rep. Pat Toomey (R-Pa.) in one of the nation's marquee Senate races this fall. President Obama is set to headline a fundraiser for Sestak later this month, and the congressman has said he expects former President Bill Clinton to stump for him, too. 

-Updated at 6:50 p.m. and 9:07 p.m.