The loonie fell 0.13 of a cent to 100.14 cents US.
"Politics have been an important driver today as corruption allegations against Spanish Prime Minister (Mariano) Rajoy weigh heavily on the political outlook and drive Spanish yields higher," said Scotia Capital chief currency strategist Camilla Sutton.
"In addition, the looming election in Italy continues to make headlines."
The upcoming election is proving to be a closer race than many people had thought and there are worries that the next Italian government might dilute the financial reforms put in place by the administration of Mario Monti.
The situation in Spain is also generating concern as the government is increasingly embroiled in a corruption scandal. On the weekend, Rajoy denied allegations that he and members of his party accepted secret payments. The developments sent Spanish yields higher on two- and 10-year bonds by 20 basis points
The European Central Bank is meeting this week as well. Though no change in policy is expected, traders will look to see what bank president Mario Draghi has to say about the strength of the euro.
The euro's advance in recent weeks is a sign of optimism over the currency’s future following a seeming easing in financial market worries over Europe’s debt crisis. But it potentially makes life more difficult for the eurozone’s exporters and that could delay a recovery from recession.
Commodity prices closed off the worst levels of the session as the March crude contract on the New York Mercantile Exchange lost $1.60 to US$96.17 a barrel.
April gold bullion gained $5.80 to US$1,676.40 an ounce while March copper slipped two cents to US$3.77 a pound.
On the economic front, data showed U.S. factory orders for December coming in below expectations.
Factory orders increased 1.8 per cent from November, lower than the 2.5 per cent reading that economists had expected. And November factory orders were revised down to show a 0.3 per cent decline.