Marmorstein describes the SD leader's line number as a typical "Jimmie Åkesson number".
According to Marmorstein, Åkesson paints a very dark picture of the situation in Sweden with the common thread "what did we say?".
- It is a position that has really benefited the Sweden Democrats over the years, to stand outside and put the blame on the others.
This has enabled them to capture voters' dissatisfaction with the state of affairs.
But now you want to be part of a collaboration, and then it becomes more difficult to have that position, she says.
The image of the Sweden Democrats as a political outsider fades not least in the light of this week's budget vote, where the alternative negotiated by M, KD, and SD was voted through in the Riksdag.
But regardless of how the collaboration affects the view of the party's own responsibility, the budget vote is a great victory for Åkesson, according to Marmorstein.
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That very thing, to be really let in in the heat, is a step in the right direction in what are the Sweden Democrats' long-term goals.
That is, to challenge the Social Democrats as the largest party.
"Can push a hard line against Kristersson"
However, it remains to be seen what the co-operation between the three parties will look like in the future.
Although they have been able to agree on a budget proposal, there are still differences of opinion on the question of a possible government formation after the next election.
Before the congress, Åkesson told DN that the party had voted no to Kristersson if it was his name that went under the Riksdag club on Monday.
To release a moderate prime minister, SD demands far-reaching negotiations and "influence over the entire policy area", was the message from Åkesson.
- This indicates that the Sweden Democrats want a program that is at least as comprehensive as the January agreement.
If you take them at their word, they will push a very hard line against Kristersson if he is allowed to form a government, says Elisabeth Marmorstein.