Passage Summary: Since students seem to like social services more by the time they graduate than when they start, college graduates must like social services more than the rest of the world does.

Conclusion: People with a university degree are more likely to support government social services than the average person in the general population is.

Reasoning: A higher percentage of seniors at a university support social services compared to the percentage of freshmen who support them.

Analysis: The argument makes a massive leap from a small, specific group (students at one point in time) to the 'overall population.' To weaken this, we need to find a reason why the change in students doesn't represent the general public or why the comparison is unfair. Perhaps the general population already supports social services at an even higher rate than the graduating students, making the 'university effect' irrelevant.