There’s certainly cases where the wrong person is being blamed, but I think generally the right people are blamed but they’re looking to the wrong people for answers. When the LPC campaigns on affordable housing, they absolutely deserve to be raked through the coals even if it’s “not a federal issue”. The recent inflation is, to an extent, out of their control but at the same time their response was still lackluster.

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There’s no legal barrier given the prime minister is barely legally recognized at all, however they would almost certainly not be leading with the confidence of the house and doing so would likely result in a constitutional crisis.

There are no official requirements to be prime minister, just that they must lead with the confidence of the House. The government general could technically appoint whoever the hell they want, but by convention a prime minister should be an MP (or at least will soon to be an MP) who leads the leading party or coalition and it would be a complete political shitshow that’d likely lead to a constitutional crisis were it egregiously broken.

Edit: also to specify, the PM isn’t elected by parliament, it’s an appointed position by the governor general

Sure there are plenty of capable 70 year olds, but mid to late 70s is where dramatic health changes is very short periods of time and diminished mental capacity starts to be commonplace. 65 as an age limit to run (meaning the oldest senators could be 71) makes a lot of sense.