No, not a chance. And it's not as though Roosevelt or Congress had any choice.
During the Depression, there were bitter memories of World War 1, which was like double the US casualties in Vietnam but compressed into only a couple of years. The anti-war movement was huge. Millions of people had been outraged by US entry into what was seen logically as a European war between imperialist countries. They were mostly right, too, the first world war served almost no US interests at all, regardless whether it ended quicker because of US involvement. US involvement also made WW1 end so lopsided that another war was practically inevitable.
Because of the anti-war movement, Roosevelt's hands were tied. Likewise Congress wanted no part of a war. Back then, it wasn't like now where the President can just say, "ok we're going to war, you guys go drum up support and get Congress to authorize it." In those days the Constitution was taken seriously; troops were not sent into major combat, especially overseas, without a formal declaration of war by Congress. And congress would never have authorized the President to wage war without a formal declaration, as has been done for the past 60 years (there hasn't been a war declaration since 1941). Roosevelt himself was very partial to the British, and tried to help them with a "lend/lease" program where he would send them supplies but be pretending not to actually giving them free, which the Germans could have considered a hostile act.
The anti-war movement cut across the political spectrum and all ideologies. There was a powerful pro-Nazi movement in America which the government was very nervous about. The left was generally partial to the Soviet Union but since the Germans didn't attack Russia till around the same time the Japanese attacked the US, they were largely against the war, then when the USSR was threatened, they were divided about it. Being openly pro-war was to risk being stereotyped as a WASP elitist, or as the old-style capitalist/imperialist involved in ww1 who were widely hated. Roosevelt walked a fine line.
There are some who suspect that Roosevelt knew Japan would attack in December 1941, and deliberately manipulated events to make sure the attack would be devastating, but not to the US carriers, and to ensure that the Japanese declaration of war would not be delivered until after the attack. Whether he did or not, the attack on Pearl Harbor was the only thing that could possibly have made Americans accept full involvement. If Roosevelt had tried to enter the war without someone having attacked, it would have seriously backfired on him; any attacks by Germany or Japan would be seen by the public not as an outrage but as a result of Roosevelt's foolishness. War production would not have been nearly as high, and people would have resisted and dodged the draft.
Nowadays of course, the US routinely attacks other countries without making formal declarations of war, and the president doesn't really care what the people think; propaganda is called "media" now, but it's much more effective than it was when it was called propaganda.