To answer the topic, I think that space programs would get a lot more funding, various extremists would get all friggy, and there would be massive and largely uninformed debate in both government and the internet, with various celebrities and important people spouting off completely uninformed opinions, with only a few informed positions standing out among the babble. The Pope would probably say something non-specific but applicable, such as urging them to meet with the aliens peacefully and non-disruptively.
Overall, America, India, maybe China, maybe SpaceX would all send scientific missions very quickly to study the lifeforms, and they would all try real hard not to change it from its current state so that they could study how it behaves under normal circumstances. If it was intelligent, I'm pretty sure that after lots of ethical debate, the scientists just wouldn't be able to help themselves from making first contact, despite the historical precedents for what happens when humans make first contact with other groups of humans.
This ended up sounding a lot more cynical than I meant it to. I really think that it would be super awesome and world-changing for the better if we found life on another planet.
Slightly less on-topic, this is a mighty entertaining argument, and I have a question to pose that sort of relates to it: if we found intelligent life on mars, and that life was living in an exceptionally peaceful, happy, and well organized society, but technologically was very far behind us, which would you consider more advanced, and why?