Putting that more clearly - blogging is largely an anti-establishment thing, and the left are currently the establishment.
This is temporary and reversible. Read the Goldberg file from the 1990s, and indeed the Drudge report and the Instapundit and 101 other right-leaning blogs from the Clinton era. The wisdom at the time was that the right were on top, and the Democrats were just useless at this internet thing. Spool on through two Republican presidencies and the story is the opposite - Web 2.0 is supposed to be all about the Democrats.
But ultimately, the trends of the internet will all look very different if and when a Conservative Government comes into power.
Now, it may be that I will be proven wrong, but I do not believe that the Left will come to dominate. Britain is rather different from the US, its politics not so polarised. The real dominant force in British political blogging is that of the libertarians and the Conservatives are not libertarian (indeed, it can be argued that they have become even less so than they were).
Whilst the Conservative Iain Dale may find less to complain about, I am not sure that Guido necessarily will (although perhaps a Conservative government will prove a litmus test?). But these two are only the biggest; it is the libertarians who are the widest.
Your humble Devil will, of course, continue to lambast all corrupt, ignorant and perfidious politicians of whatever stripe, party, sex or race. I have no doubt that the vast majority of my libertarian blogging colleagues will also continue to do so: after all, we will always be anti-establishment; a minarchist libertarian is, almost by definition, anti-state and, until the state abolishes itself, peeling away the rotting flesh and leaving only the core, we will continue to attack and savage it.
And the state will never abolish itself voluntarily, so we libertarians will always be here.