The Guardian doesn't tow a political line particularly......its regular writers are a mixture of many different viewpoints....for example George Monbiot, would be considered radical green, whereas Simon Hoggart might be considered one nation Tory, and Roy Hattersley old Labour.
Largely, though it would be considered anti racist, pro feminist, internationalist, and pro democracy.
They definately alligned themselves with New Labour, hence why they got rid of Mark Steele around '97. I still think The Independant is the best paper for giving an objective point of view.