Try either:
driver.find_element_by_xpath(u'//a[text()="Foo text"]')
or dedicated driver method:
driver.find_element_by_link_text("Foo text")
Add .click()
if needed.
For troubleshooting, check this postpost at SO, as maybe your page isn't loaded yet, so you probably need to write a wait wrapper to wait for an element to appear.