Coming Up on 'This Week' ... John Brennan and Sens. Robert Menendez and John Cornyn

— -- Two big stories this week: the discovery of an international terror plot and the home stretch of the midterm elections. We'll begin with the latest on the investigation into the shipment of explosive devices which originated in Yemen from the president's top counterterrorism advisor, John Brennan.

Then, on the last weekend before Election Day, the president will be barnstorming the Midwest, Sarah Palin will be rallying Republicans, candidates will be working hard to get out their vote and, in the nation's capital, two late night comics will be on the Washington Mall rallying for sanity. We'll cover it all on "This Week" with an exclusive look at our last ABC News/Washington Post poll before the critical midterm vote.

Just two days before the election, has anything changed in these final hours to avert a potential power shift in Washington? Our poll will give us some clues.

Then, we'll look at the state of the Senate races. We'll get reports on the ground from three critical and exceedingly close Senate races plus an exclusive debate with the men in charge of their parties' battle plans: Republican campaign chairman Sen. John Cornyn, R-Texas, and Democratic campaign chairman Sen. Robert Menendez, D-N.J. Can Republicans take the Senate? Will the Democrats' firewall hold? And with a massive influx of secret money impacting races, exactly who is paying for these campaigns? Cornyn and Menendez -- only on "This Week."

Then, Jon Stewart and Stephen Colbert bring their "Rally to Restore Sanity and/or Fear" to Washington, and Christiane Amanpour is there. Will fear win out? Will mocking the system make it better? Will people who attend the rally turn out to vote?

Plus, on our roundtable, the former House majority leader and current chairman of Freedom Works, Dick Armey, joins George Will, Cokie Roberts, Democratic strategist Donna Brazile and ABC News' Senior Congressional Correspondent Jonathan Karl to debate the coming election. Will the House turn red in a ripple or a wave? How will the Tea Party movement change the Republican Party? And how will the White House deal with the new political realities in Washington? A "This Week" election 2010 preview -- you won't want to miss it.