403: Forbidden when using getTweets python function

[anansi]

I am getting this error for accessing a user profile with the code:

tweetCriteria = got.manager.TweetCriteria().setUsername('barackobama').setMaxTweets(1)
tweets = got.manager.TweetManager.getTweets(tweetCriteria)

Error is:

An error occured during an HTTP request: HTTP Error 403: Forbidden
Try to open in browser: https://twitter.com/search?q=%20from%3Abarackobama&src=typd

Has twitter updated its scraping detection? Please help