Since the 1960's Plaid Cymru has proved itself to be the second choice of disgruntled Labour voters. From the 1960's to the 1990's Plaid has managed to get 15%, 20% even 39% swings from Labour in by-elections but without winning a seat because of the weight of the Labour vote.
The days of Labour winning a seat despite a 39% swing against it in Wales have been over for some years.
Apart from perhaps Alyn and Deeside and Monmouth Plaid would be in a strong position to win any Welsh by-election called today. Bloody hell, Plaid even won Islwyn in 1999, despite the fact that many people in the constituency claim that Islwyn, Monmouthshire, is a part of England!
The clear problems for Plaid is that today's pissed off voter doesn't switch party, he / she just doesn't vote! That is why the Tories topped the poll in Wales for the first time in 150 years in the Euro Elections !
If Plaid can persuade the peeved to vote Plaid rather than not to vote at all, Plaid could gain, 11, 12, 15 or even more constituencies in the next Westminster election. With 20-to 30 SNP members and an outside possibility of an MK member, the national group could prove pivotal to the next parliament. Being pivotal is good for Wales, good for Cornwall and good for Scotland – Vote Plaid - Vote SNP – and Vote MK to make it happen!
The best option for Wales isn't a continuation of the present Labour government, nor swapping it with a Tory Government but a hung government where the voice of Wales counts. Lets hang the bastards by voting Plaid!