If you thought 40% of the population voting for 70% of a legislature was bad, how about 40% of the population voting for 0% of the legislature? Take a look at the results of the 1987 New Brunswick general election.
Liberal - 60.39%
Progressive Conservative - 28.59%
NDP - 10.55%
Independents - 0.47%
In this election, the Liberal Party of New Brunswick won all 58 seats in the provincial legislature. A full 40% of the population was not even represented by one single member of an opposition party.
So, under the first past the post system, not only is it possible for a minority to elect a majority and for the second most popular party to form a majority government (see False Majorities) - it's even possible for an opposition to be completely shut out despite taking 40% of the vote.
This is democratic?
[H/T, Political Staples]